An easy process to fabricate highly luminescent and color-purepolymer-encapsulated halide perovskite color converters is reported.Methylammonium lead bromide (MAPbBr_3) with an additive of amantadinehydrochloride is prepared by dry mechanochemical synthesis together with anencapsulating polymer. (In this report, poly(methyl methacrylate), polystyrene,and polyethylene oxide are investigated.) The composite material is heatedand pressed into a thin disk exhibiting strong luminescent properties. Byadjusting the weight percentage of the perovskite in the polymer, the disk canbe opaque or transmissive. The disks are stable in air for over 2 months. Byinserting a secondary emitter, white light can be obtained by illuminating itwith a blue light source.
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